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Campbell & Thayer......

Linseed Cake.

New York.......

Linseed Oil.

Atlantic White Lead Co.-Rob't Colgate & Co. New York........

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.See Page 264

.See Pages 238, 240

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..........Philadelphia, Pa.............

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Lithography.

.Philadelphia, Pa..........

.See Page 90

.........New York..

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Warren, Johnson & Co

Buffalo, N. Y.....

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Feet. 2

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Tensile resistance of the plates without Riveting is taken at a mean of 55,000 pounds per square inch.

The single-riveted are estimated at 5 the resistance of the plates, and the staggered riveted at .65.

Such allowances for the resistance and wear of the plates, oxydation, etc., are to be made, as the character of the metal, the nature of the services, and the circumstance of using fresh or salt water, etc., will render necessary.

In riveted plates, it is customary in practice to estimate the safe tensile resistance of the metal of a boiler or tube, when exposed to salt-water, at one-fifth of its ultimate resistance or bursting pressure; and, when exposed to fresh-water alone, at one-fourth of it.

Single
Riveted.

Double

Riveted.

TRENTON VISE TOOL WORKS,

TRENTON, N. J.

HERMANN BOKER & CO.,

PROPRIETORS.

Office and Warehouse, 101 & 103 Duane Street, and 91 & 93 Thomas Street,

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Chisels, Tongs, Bench Screws, Wedges, Crowbars, &c.

SEND FOR ILLUSTRATED PRICE LIST.

Railroad Mauls.

Ship Mauls.

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Buffalo Steam Gauge Co......

Radley & McAlister Manufacturing Co....... .New York........
Vose Dinsmore & Co...............

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...Buffalo, N. Y...........

See Page 170

250

60

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18

See notes at foot of table about "Shells of Boilers," page 153.

AMERICAN

SAW COMPANY,

No. 1 FERRY STREET,

COR. OF GOLD

NEW YORK.

Patent Movable-Toothed Circular Saws,

PATENT PERFORATED

CIRCULAR SAWS, MILL, MULAY

AND

CROSS-CUT SAWS.

SEND FOR PAMPHLET,

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Table gives Feet of Board Measure to One Running Foot of Board.

Area of a running foot multiplied by length in feet, will give superficial contents of board in square feet.

Application of Table:

A board is 1 inch thick, 1 foot 434 inches wide by 21. feet long. What is its contents? Answer, 1 foot equal 1, and 434 in. equal .3958, therefore, 1 foot 434 in. equal 1.3958, multiplied by 21, equal 29.3 feet, which is contents of board.

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